[PATCH vhost 0/7] vdpa/mlx5: Add support for resumable vqs

Dragos Tatulea
2023-12-01T10:49:35Z

Add support for resumable vqs in the driver. This is a firmware feature
that can be used for the following benefits:
- Full device .suspend/.resume.
- .set_map doesn't need to destroy and create new vqs anymore just to
update the map. When resumable vqs are supported it is enough to
suspend the vqs, set the new maps, and then resume the vqs.

The first patch exposes the relevant bits in mlx5_ifc.h. That means it
needs to be applied to the mlx5-vhost tree [0] first. Once applied
there, the change has to be pulled from mlx5-vhost into the vhost tree
and only then the remaining patches can be applied. Same flow as the vq
descriptor mappings patchset [1].

To be able to use resumable vqs properly, support for selectively modifying
vq parameters was needed. This is what the middle part of the series
consists of.

[0] https://git.kernel.org/pub/scm/linux/kernel/git/mellanox/linux.git/log/?h=mlx5-vhost
[1] https://lore.kernel.org/virtualization/20231018171456.1624030-2-dtatulea@nvidia.com/

Dragos Tatulea (7):
vdpa/mlx5: Expose resumable vq capability
vdpa/mlx5: Split function into locked and unlocked variants
vdpa/mlx5: Allow modifying multiple vq fields in one modify command
vdpa/mlx5: Introduce per vq and device resume
vdpa/mlx5: Mark vq addrs for modification in hw vq
vdpa/mlx5: Mark vq state for modification in hw vq
vdpa/mlx5: Use vq suspend/resume during .set_map

drivers/vdpa/mlx5/core/mr.c | 31 +++---
drivers/vdpa/mlx5/net/mlx5_vnet.c | 172 +++++++++++++++++++++++++----
include/linux/mlx5/mlx5_ifc.h | 3 +-
include/linux/mlx5/mlx5_ifc_vdpa.h | 4 +
4 files changed, 174 insertions(+), 36 deletions(-)

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2.42.0